5.2 Circular Motion

Question 1

What the radian

Answer 1

The angle subtended by a circular arc with a length equal to the radius of the circle

Question 2

How do you convert from degrees to radians

Answer 2

Times by pi/180

Question 3

Define angular velocity

Answer 3

Rate of change of angle

Question 4

Define the time period

Answer 4

Time taken for one complete oscillation

Question 5

Which direction does the centripetal force act

Answer 5

Perpendicular to the velocity

Question 6

How is an object accelerating if travelling at constant speed

Answer 6

If the object is travelling in circular motion the direction is always changing hence always accelerating even though speed is constant

Question 7

Define the centripetal force

Answer 7

The force acting perpendicular to the velocity of an object and towards the centre of the circle

Question 8

Describe an experiment to investigate circular motion

Answer 8

-Use a string with 2 bung at either side which has been passed through a glass tube
-Spin the bung at the top
-If the centripetal force is greater than the weight of the bung, the bung will move up
-Use a paper clip for clear indication